Cal. Pub. Util. Code § 13134

The electric system of the district to which the indebtedness pertains shall not be sold or otherwise disposed of, as a whole or substantially as a whole, unless such sale or other disposition be so arranged as to provide for a continuance of payments into a fund sufficient in amount to permit payment therefrom of principal of, and interest on, and premiums, if any, due upon the redemption of, all bonds issued under this chapter.